Electrical transmitter for aural reception



Aug. 11, 1925. 1,549,099

0. E. MARVEL ELECTRICAL TRANSMITTER FORAURAL RECEPTION Filed June 1920 Patented Aug. 11, 1925.

ORIN E. MARVEL, OF DAYTON, OHIO.

ELECTRICAL TRANSMITTER FOR AURAL RECEPTION.

Application filed June 29, 1920. Serial No. 392,825.

To all whom it may concern:

Be it known that I, ORIN E. MARVEL, a citizen of the United States, residing at Dayton, in the county of Montgomery and State of Ohio, have invented-certain new and useful Improvements in Electrical Transmitters for Aural Reception, of which the following is a specification.

'This invention relates to electrical transmitters for aural reception.

An object of this invention is to provide a transmitter for electrical reception which is uninfluenced by the passage of strong wind and inert toward noises extraneous of the sounds or speech transmitted.

In the preferred form of my invention the transmitter is adapted to be positioned at the throat of the operator and is constructed and arranged to permit proper body move ment of the operator incident to drivin or operating airplanes, automobiles or the Tike and to be sealed automatically against the fiow of high wind current and against the reception of influence of extraneous noises.

In the preferred form of my invention the transmitter comprises two transmitter buttons, each button including a movable electrode adapted to vibrate corresponding to the vibrations of the neck of the operator on opposite sides of the esophagus, the remaining electrodes being relatively fixed, and mounting means for such buttons and the electrical elements connecting the same with a telephone wiring arrangement. Such vibration responsive relation may be readily effected by the provision of a diaphragm of suitable resilient material and suitable vibration transmitting means connecting such diaphragm with its movable electrode.

Further featuresand objects of the invention will be more fully understood from the following description and the accompanyin drawings, in which I Fig. 1 is a horizontal sectional View of one form of m invention;

Fig. 2 1s a side elevation of Fig. 1 as viewed from line 2-2of Fig. 1 showing the band 3 removed;

Fig. 3 is a sectional elevation on the line 3 3 of Fig. 1 showing the band 1 removed.

Figure 4 is a section of one of the transmitter buttons showing the same in detail.

Referring to the drawings, the invention is shown in an embodiment of the type for use about the throat of the operator, and 5 for such purpose the band 1 of leather is provided having, as shown in Fig. 1, the general contour of the neck of a person, such band 1 being provided with suitable fastening means 2 for clasping the same at the back of the neck. The outer band3 connects with the inner band 1 from the location 4 forwardly and to the location 5, resulting in a general crescent-like formation, within which are the oppositely disposed blocks of sponge rubber 6, 7, and the forwardly disposed .block of sponge rubber 8.

Suspended by such blocks of sponge rubber is the bent strip 9, of general circular form but more or less arched at 10, 11, for the support of the two transmitter buttons.

As shown, each transmitter button comprises the fixed electrode 12, removably mounted on the contact lug 13 and movable electrode 14, which is held by a mica disk in the electrode case 15' with carbon granules 12" therebetween, in the customary manner. To such movable electrode 14 is connected an armature of soft and resilient material 14 suchas sponge rubber, one part of which is adapted to be placed in contact with. the throat of the operator, and the sec- 0nd part, 14", which is held suspended at its circular edge within the annulus portion 16 of the strip 15, which may be of aluminum or other suitable rigid and light material. The part 14" serves as a iaphragm or a transmitting part: to transmit the vibrations of the throat of the user to the movable electrode. A resilient strip of metal 17 is held between the strip 15 and the bent strip 9, and this strip 17 is suitably bent as shown in Figure 1 and bears against the part 14 of the armature.

The electrical connection between the two transmitter buttons is similar to the connection of ordinary telephone transmitters, and for this reason the particular use of the transmitter and its electrical connections with a radio receiving and transmitting set is not shown.

Upon articulation by the operator, the outer wall of the operators neck adjacent to the esophagus is vibrated in correspondence to the sounds emitted by the operator through his mouth, thereby vibrating the armatures of sponge rubber, and therewith the movable electrodes; thus modifying the electrical current passing throughthe tele-- phone circuit in which the transmitter but-- tons are connected. The crescent or U- shape of the supporting bar 9 serves to maintain the fixed electrodes which are mounted on the supporting bar, in a relatively stationary position as regards the neck of the user, and the movable electrode with the sponge rubber armature connected thereto will have a small moment of inertia, so as 'to freely vibrate in correspondence with the vibrations of the users throat.

I have discovered that the particular construction of my invention is readily and conveniently carried by the operator in the performance of the duties of piloting or operating an aeroplane, or of driving an automobile, and that the efi'ect of high wind currents on the transmitter is entirely precluded, notwithstanding that the operator opens his mouth during the stage of transmitting. I have also discovered that my invention effectively renders inert the noises attending the explosions of the airplane engine and the revolutions of the propeller, as well as other noises extraneous of the speech or sound desired to be transmitted.

, Whereas I have described my invention by reference to specific forms thereof, it will be understood that many changes and modifications may be made without departing from the spirit of the invention, as defined by the appended claims.

What I claim is:

1. A telephone transmitter comprising a set of relatively movable electrodes, means;

for supporting one of said electrodes in a position fixed in relation to a vocal organ of the user, means for supporting a second electrode of said set movable in relation to the fixed electrode, a sponge rubber armature connected to said mentioned one electrode and adapted to be'placed in contact with a vocal organ ofthe user, and electrical connections for the said electrodes.

2. A telephone transmitter comprising a set of relatively movable electrodes, means for supporting one of said electrodes in a position substantially fixed in relation to a vocal organ of the user, means for supporting a second electrode of said set movable in relation to said fixed electrode, and sponge rubber cushionin means connected to -said one fixed electro e and adapted to be placed in contact with a vocal organ of the user, said one 'fixed electrode having a small moment of inertia so as to freely vibrate in co respondence with the movements of the cus ioning means.

3. A telephone transmitter comprising a plurality of sets of relatively movable electrodes, a substantially U-shaped rigid supporting member upon which one electrode of each set, in fixed position, is mounted, one on each leg of the U, means for movably supporting a second electrode of each set adjacent the fixed electrode of each set, means connected to said movable electrodes and adapted to be placed in contact with the throat of the user, and electrical connections to the several electrodes.

4. A telephone transmitter comprising two transmitter buttons, each button having a fixed and a movable electrode, means for supporting said buttons adjacent the throat of the user, on opposite sides thereof, comprising inner and outer bands of flexible material, spaced blocks of yielding material disposed between said bands, and a rigid member upon which the fixed electrode of each button is rigidly mounted, supported by said blocks, and yielding means connected to each movable electrode and adapted to be placed in contact with the throat of the user.

'5. A telephone transmitter comprising a plurality of sets of relatively movable electrodes, yieldingly arranged means for supporting said sets and constructed to be positioned adjacent'the throat of the operator,

' said supporting means comprising an inner band of flexible material, an outer band of flexible material, spacially disposed blocks of yielding material secured between said two bands, and a strip of rigid material supported by said blocks, said sets of electrodes being disposed between said blocks and .mounted on said strip, and a diaphragm for each set of electrodes of resilient material carried by said supportingmeans and arranged to vibrate in correspondence to the vibration of the walls of the throat of the operator and to transmit such vibrations to its respective electrode.

6. A telephone transmitter comprising a transmitter button having a fixed and a movable electrode, means for supporting said fixed electrode in a stationary position adjacent the throat of the user, comprising a U-shaped rigid strap adapted to extend partially around the throat of the user, and blocks of yielding material upon whichsaid stra is mounted, so that the movable electro e will be placed adjacent the throatvof the usr.

In testimony whereof I have aflixed my signature.

' ORIN E. MARVEL. 

